Ed Bayliss asks about small electric glue pots.  I use the small
version of the German Herdim glue pot from Dictum GmbH:
http://www.mehr-als-werkzeug.de/product/736001/Herdim-Glue-Pot-Ceramic-Container-025-l-220-V.htm 

There is also a larger 1 litre unit.  Whilst they are expensive
I can personally vouch for the reliability of smaller, .25 litre pot
which I have had for around 10 years.  It maintains a very constant
temperature, which is controllable.  I did have to replace the
element a year ago, but it was easy to obtain and fit.

John Farmer, UK